This is a screenshot of our demo related to snow generation and
rendering.
We worked last days in implementing some fast snow generation in
WhiteEngine.

The process take place in two steps: First snow is generated on objects
based on density and where the snow falls from.
Seccond, particle system are used for animation. We didn't optimize the
system, as each particle is a single snow particle. For faster graphics
and thicker snow, more snow can be represented with one particle.
For the first step of snow generation on objects we are studding now new
ways on doing this.
It runs in DX 8.1 at least.